{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80789", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.793Z", "datePublished": "2026-09-04T15:13:01.161Z", "dateUpdated": "2026-10-19T08:43:42.439Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:43:42.439Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: bound SGL data length before allocating command buffers\n\nnvmet_tcp_map_data() reads the host-controlled 32-bit sgl->length\nand, for the in-capsule offset descriptor (type 0x01), checks it\nagainst port->inline_data_size before use. Any other SGL descriptor\ntype -- including the non-inline transport SGL data-block descriptor\n(type (NVME_TRANSPORT_SGL_DATA_DESC << 4) | NVME_SGL_FMT_TRANSPORT_A,\nthe type a real host uses for out-of-capsule writes) skips that check\nentirely and falls straight through to:\n\n\tcmd->req.sg = sgl_alloc(len, GFP_KERNEL, &cmd->req.sg_cnt);\n\nwith len taken directly from the wire, unbounded up to 4 GiB.\n\nnvmet_req_init() only parses the command and never inspects\nsgl->length, and nvmet_check_transfer_len() -- the only other place\ntransfer_len is validated -- runs later, from req->execute(), after\nthe allocation has already happened. For a write command the target\nresponds with an R2T and parks the command waiting for the host to\nsend the data; if the host (or an unauthenticated peer that simply\nnever follows up) never does, the sgl_alloc() buffer stays resident\nfor the life of the command. NVMe/TCP has no mandatory authentication\nin the default configuration, so any peer able to reach the target\nportal and complete a Fabrics connect can drive this with a single\ncrafted command, repeatable across queues and connections for\namplification. This is unbounded kernel memory allocation\ntriggered by a remote, effectively unauthenticated peer.\n\nValidate len against the same NVMET_TCP_MAXH2CDATA ceiling this file\nalready uses to bound per-PDU H2C data, for every SGL descriptor type,\nbefore doing any allocation. This closes the gap for the non-inline\ndescriptor while leaving the existing, tighter inline_data_size check\nin place for the in-capsule case.\n\nRuntime-verified on a v6.19 KASAN stand: with this bound in place, a\ncrafted write command carrying an oversized non-inline SGL length is\nrejected before sgl_alloc() runs, where the same request previously\ndrove an unbounded ~256 MiB kernel allocation (up to 4 GiB) that\nstayed resident pending an R2T the host never satisfies." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/tcp.c" ], "versions": [ { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "f63e89a0310264264923f84406dea05fe752de62", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "0952541b153e258b99d39cdb03ea6919fdeb41d0", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "d2acc96c528d589f5827cfb90e8e9229dd9d8cb4", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "6d27199ebe8cb223022150f74be13f154a964474", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "14dbe37681a6a7e346fc147bb363ec7cca3180a0", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "d895e66628f939edbb98608f6e033d3d39e6e546", "status": "affected", "versionType": "git" }, { "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30", "lessThan": "4a3f00262a044e8e15064b1a6860968bf0500bf4", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/nvme/target/tcp.c" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.269", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.220", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.187", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.156", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.106", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.47", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.11", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.1", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.269" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.187" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.156" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.106" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.47" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.1.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f6e51b09cbaa5f6f6e6a3a9dafa666f76c37aab5" }, { "url": "https://git.kernel.org/stable/c/f63e89a0310264264923f84406dea05fe752de62" }, { "url": "https://git.kernel.org/stable/c/0952541b153e258b99d39cdb03ea6919fdeb41d0" }, { "url": "https://git.kernel.org/stable/c/25ad03d5c0e858c4b63f1e4b6d461d2af1b30b22" }, { "url": "https://git.kernel.org/stable/c/d2acc96c528d589f5827cfb90e8e9229dd9d8cb4" }, { "url": "https://git.kernel.org/stable/c/6d27199ebe8cb223022150f74be13f154a964474" }, { "url": "https://git.kernel.org/stable/c/14dbe37681a6a7e346fc147bb363ec7cca3180a0" }, { "url": "https://git.kernel.org/stable/c/d895e66628f939edbb98608f6e033d3d39e6e546" }, { "url": "https://git.kernel.org/stable/c/4a3f00262a044e8e15064b1a6860968bf0500bf4" } ], "title": "nvmet-tcp: bound SGL data length before allocating command buffers", "x_generator": { "engine": "bippy-1.2.0" } } } }